Fel Flame was a core warlock ability learned at level 77. It was a quick-hitting spell that dealt Shadowfire damage. This was similar to the mage ability [Frostfire Bolt], in that the lower of the two resistances (in this case shadow and fire) on the warlock's target would be used for calculating its damage. The goal for Fel Flame was to provide a spell that was good for mobility. The ability used green fire and was instant cast.